/**
 * Copyright (C) 2010 Nicolas Vahlas <nico@vahlas.eu>
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *         http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package com.sung.json.scheam.impl.validators;

import com.sung.json.scheam.impl.JSONValidator;
import org.codehaus.jackson.JsonNode;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import java.io.Serializable;
import java.util.ArrayList;
import java.util.List;

/**
 * Implements "minItems" validation on array nodes as described in
 * the paragraph 5.11 of the JSON Schema specification.
 */
public class MinItemsValidator implements JSONValidator, Serializable {

    private static final long serialVersionUID = 5843869888459032277L;
    private static final Logger LOG = LoggerFactory.getLogger(MinItemsValidator.class);

    public static final String PROPERTY = "minItems";

    private int min = 0;

    public MinItemsValidator(JsonNode minItemsNode) {
        if (minItemsNode.isIntegralNumber()) {
            min = minItemsNode.getIntValue();
        }
    }

    @Override
    public List<String> validate(JsonNode node, String at) {
        LOG.debug("validate( " + node + ", " + at + ")");
        return validate(node, null, at);
    }

    @Override
    public List<String> validate(JsonNode node, JsonNode parent, String at) {
        LOG.debug("validate( " + node + ", " + parent + ", " + at + ")");

        List<String> errors = new ArrayList<String>();

        if (node.isArray()) {
            if (node.size() < min) {
                errors.add(at + ": 必须有一个最小值: " + min + " 元素在这个数组中");
            }
        }

        return errors;
    }

}
